Infusible
Infusible , adjective
[From Infuse, v.]
Capable of being infused.
Doctrines being infusible into all.
Infusible , adjective
[Prefix in- not + fusible: compare French infusible.]
Not fusible; incapable or difficult of fusion, or of being dissolved or melted. — Sir T. Browne
The best crucibles are made of Limoges earth, which seems absolutely infusible.